To carry lawns to the outside of a stadium and to rear these lawns when the lawns within the stadium are damaged.

A movable base 26 in which lawns 24 are planted by raising the ground level 22 in a container-shaped pallet 20 is composed and the base is arranged on the ground 14 on which artifical lawns are installed. At the place adjacent to the outdoor of a stadium 10, a liquid fertilizer tank 28 which is possible to store the movable base 26 is installed. When the lawns 24 are damaged or a season-off comes, the whole of the movable base 26 is moved and is placed on the elevation base 34 formed on the liquid fertilizer tank 28. An elevating device 36 is worked, the elevation base 34 is lowered, the whole of the movable base 26 is dipped in liquid fertilizer A up to a prescribed depth and the lawns 24 are reared in this state.